研究一种Fe-Mn-C系新型TWIP钢的力学性能和微观变形机制。采用静态拉伸方法测试Fe-20Mn-0.6C钢在热轧和冷轧及热处理后的力学性能,通过金相、X-射线衍射、透射电镜观察等方法研究该钢的微观组织演变。结果表明：试验钢经过热轧后,表现出优异的综合力学性能,伸长率高达100%,抗拉强度达到924MPa。将热轧钢板经过适量冷轧后其抗拉强度提高到1 210MPa。热轧态组织为等轴的奥氏体基体及退火孪晶,拉伸变形后其微观组织中孪晶密度显著增加,晶粒内由一套孪晶系逐渐演化为两套孪晶系,而且因变形诱导马氏体相变产生大量马氏体组织。
Tensile tests were carried out to explore the mechanical properties of a Fe-20Mn-0.6C steel after the hot-rolling and the cold rolling deformation.The microstructure evolution was characterized by the optical microscopy,X-ray diffraction(XRD) and transmission electron microscopy(TEM).The results indicate that the steel after hot rolling have attractive mechanical properties,while the elongation reaches 100% and the tensile strength is 924 MPa.After cold rolling,the tensile strength of the steel increases to 1 210 MPa.The microstructure of the hot-rolled steel mainly contains the austenitic matrix and annealing twins.However,after tensile deformation,twin density is remarkably enhanced and numerous martensitic plates are also occurred.
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